Bomb releasing guide



Sept. 1, 1936. H. RAABER BOMB RELEASING GUIDE Filed Sept. 28, 1934 Patented Sept. 1, 1936 UNITED STATES PATENT OFFICE norm RELEASING GUIDE 4 Hana Raaber, Purkersdorf, near Vienna, Austria, assignor to Actiengesellschaft C. l. Goers ptische Anstalt Actiova Spolenost K. P. Goers opticky fistav, Bratislava, Czechoslovakia, a company of Czechoslovakia Application September 28, 1934, Serial No. 746,022

In Germany October 6, 1933 3 Claims.

tained bys'ecuring to the side wall of the air-' craft a bracket carrying two screw spindles, one

being truly vertical, each of the two said spindles carrying a nut locked against rotation. One of the said screw spindles is adapted to be rotated and its nut carries a sight mark hereinafter called the preliminary sight mark. The nut of the other screw spindle carries a sight rule hereinafter called the releasing sight rule. This latter and the preliminary sight mark are so adjusted that when the screw spindle carrying the nut of the preliminary sight is uniformly rotated for a certain time after the preliminary sight mark has come into coincidence with the target, the preliminary sight reaches the releasing sight and this indicates the exact moment at which the ,missile must be released. I prefer to provide my apparatus with means for compensating for the necessary leading.

A constructional form of the present apparatus is illustrated by way of example in the accompanying drawing. Fig. 1 illustrates diagrammatically the mechanical principle of the ,ap-

paratus, while Figs, 2 and 3 show an apparatus based on said principle, in side elevation and rear elevation respectively.

In Fig. 1, 0A is the releasing sight line deter-- when the target appears in the sight line 0A1, a

clockwork is thrown into action which causes the sight mark A1 to move downwards at the speed until, after a period of time tz, said sight mark A1 reaches the releasing line CA. From the similarity of triangles it follows that:

0222 representing vT and ZlZ2 representing at: and therefore OiB:A1B=vT:vt==T:t=, 2) being the speed of flight of the aircraft and t:

the time between taking the preliminary sight 1 OAlzl and the. releasing sight 032:. more the relation exists that Further- If therefore the preliminary sight mark moves vertically downwards with the speed.

then after the lapse of time t! it comes into coincidence with the releasing sight line, which is located between'the position (2 1) of the target in the preliminary sight and the position (Z2) 01 the target in the releasing sight line.

ponent of the resistance of the air, the range angle i relative to the releasing sight line OBX'Z! is less than 45, and instead of the similar triangles 0013 and AAIB, the similar triangle 00:3: and AiArBimust be considered, the parallel sides of which are inclined to the vertical by the trail angle p=ROO2. Corrected speeds are obtained therefrom which differ from c in the ratio cos 21,

the maximum value of p being in'practice about 5.

An apparatus based on this principle is shown in Figs. 2 and 3 as consisting of a rectangular bracket 2v-2h pivotally connected to the side wall of the aircraft by a Journal pin I. On the vertical arm 2v of said bracket-is journalled a vertical screw spindle 3 on which a nut 4 carrying an adjustment mark 4a is locked against rotation. By turning the screw spindle 3 by means of the knob 3a, the nut 4 may be adjusted according to a; given time of falling relative to a scale 21 on the vertical bracket arm 2v. The nut 4 carries a bearing for a journal pin 5 having a point 0 serving as an upper sight mark. Around this pivot pin 5 revolves the releasing sighting rule 6 provided at its lower end with a lower sighting mark a. The sighting rule 6 is adapted to be turned by any preliminary sighting device not shown through the range angle o-(or l) rela- Taking into account the trail due to the horizontal comtively to the vertical, whereupon it may be fixed in position. The range angle may be determined in suitable manner as for example, bythe use of the apparatus shown in my copending application Serial No. 746,021 filed on even date herewith, which apparatus shows means for'fixing a sighting rule.

On the horizontal arm 2h of said bracket is mounted a slide 1 adapted to be locked in any position. To this slide is secured a journal pin 8 on which is pivoted a bearing 9. This bearing carries a yoke 81: in which is journalled the vertical screw spindle I driven by two meshing spur wheels ll, 92 from a shaft l3 of a clockwork It, which shaft is adapted to be thrown into and out of operation and to be reversed. By so rotating the screw spindle III, a nut l5 mounted thereon and locked against rotation is moved vertically. This nut carries a pin C1 ending in a sight pin point Ai. On the journal pin' 8 is mounted a pointer 8a which indicates on the scale Ida secured to the casing of the clockwork M the inclination to the vertical of the combination of parts 9 to l5 and hence also of the screw spindle ID. The angle of this inclination is the trail angle and may be adjusted by .the worm wheel segment 912 provided on the bearing 9 by turn ing the worm l6 rotatably mounted on the slide 7.

The operation of this apparatus is as follows:

First by means of the scale on the vertical bracket arm 2v, the upper sight mark 0 is adjusted in accordance with the falling time of the missile. Then the bearing 9, together with the parts connected thereto, is shifted along the horlzontal bracket arm 2h to any desired extent and the target Z is watched until it reaches the preliminary sighting line 0A1. At this moment the shaft l3 of the clock operates, whereupon the point A1 moves downwards with a constant speed until the preliminary sighting mark A1 reaches the releasing sighting line 0a. If, however, the preliminary sighting mark A1 is provided with an electric contact, the release of the missile might be brought about automatically provided the. releasing rule 6 carries a contact edge It, so arranged that it makes an electric contact when the point A1 reaches the line 0a.

What I claim is:

1. Apparatus for automatically indicating the moment for releasing a missile from an. aircraft] comprising a vertical journal pin secured to the side wall of the aircraft, a frame rotatable about said journal pin, a preliminary sight mark carried by said frame, and with which the target is preliminarily sighted and followed, means on said frame including a clockwork for approximately vertically moving said preliminary sight mark, means on said frame forming a releasing sight line, and means for adjusting and permanently holding said releasing sight line means in a vertical plane with said preliminary sight mark,

so that the moment for releasing the missile is indicated when the preliminary sight mark intersects the releasing sight line.

2. Apparatus for automatically indicating the moment for releasing a missile from an aircraft,-

engage with each other at the proper instant of release.

3. Apparatus for automatically indicating the moment for releasing a missile from an aircraft, comprising a vertical journal pin secured to the side wall of the aircraft, a frame rotatable around said journal pin, a preliminary sight mark carried by said frame, means on said frame including a clockwork, a screw spindle rotated by said clockwork, a nut-mounted on said screw spindle, means for holding said nut against rotation, and

means for pivoting said screw spindle in a vertical plane in the direction of flight according to the trail angle, means on said frame forming a releasing sight line, and means for adjusting and permanently holding said releasing sight line means in a vertical plane with said preliminary sight mark.

HANS RAABER. 

